The number 2,772,144 can be evenly divided by 1 2 3 4 6 8 9 12 16 18 23 24 27 31 36 46 48 54 62 69 72 81 92 93 108 124 138 144 162 184 186 207 216 243 248 276 279 324 368 372 414 432 486 496 552 558 621 648 713 744 828 837 972 1,104 1,116 1,242 1,296 1,426 1,488 1,656 1,674 1,863 1,944 2,139 2,232 2,484 2,511 2,852 3,312 3,348 3,726 3,888 4,278 4,464 4,968 5,022 5,589 5,704 6,417 6,696 7,452 7,533 8,556 9,936 10,044 11,178 11,408 12,834 13,392 14,904 15,066 17,112 19,251 20,088 22,356 25,668 29,808 30,132 34,224 38,502 40,176 44,712 51,336 57,753 60,264 77,004 89,424 102,672 115,506 120,528 154,008 173,259 231,012 308,016 346,518 462,024 693,036 924,048 1,386,072 and 2,772,144, with no remainder.
Since 2,772,144 cannot be divided by just 1 and 2,772,144, it is a composite number.